The correct answer is "object complement", because it follows a direct object (in this case "the normally flat land") and renames it or states what it has become. It cannot be "predicative nominative" because "hilly" is not a noun, "direct object" here is "the normally flat land", and a predicate adjective follows a linking verb (for example, She is PRETTY.) So the only option left is "object complement".
The correct answer for the question that is presented above is this one: "TRUE." The following question refers to “The Rifles of the Regiment”: Fear is an enemy general who sneaked into the colonel’s office. This is true.
